Voltage Levels and the National Electrical Code

Voltage Levels and the National Electrical Code

What is the threshold for low, medium, and high voltages?

Ask control systems engineers what the term “high voltage” means to them, and you’re liable to get an answer such as “anything over 50V”. Ask a utility lineman the same question, and you may hear “anything over 69kV”. So, the terminology — low, medium, and high voltage — are relative to the field you are in and which context is being used.

High Voltage Sign

Register to view the full article

Register on EC&M and gain access to premium content, including this article and much more.

Hide comments


  • Allowed HTML tags: <em> <strong> <blockquote> <br> <p>

Plain text

  • No HTML tags allowed.
  • Web page addresses and e-mail addresses turn into links automatically.
  • Lines and paragraphs break automatically.